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Status of ARM Best Estimate Product CrIS EDR Cal/Val Telecon 7-May-2013

Status of ARM Best Estimate Product CrIS EDR Cal/Val Telecon 7-May-2013 L . Borg, D. Tobin, R . Knuteson , N. R. Nalli with support from our ARM partners … Donna Holdridge , Jenni Kyrouac , Jim Mather, Douglas Sisterson. ARM Best Estimate Sonde Product. Overview:

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Status of ARM Best Estimate Product CrIS EDR Cal/Val Telecon 7-May-2013

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  1. Status of ARM Best Estimate Product CrISEDR Cal/Val Telecon 7-May-2013 L. Borg, D. Tobin, R. Knuteson, N. R. Nalli with support from our ARM partners … Donna Holdridge, JenniKyrouac, Jim Mather, Douglas Sisterson

  2. ARM Best Estimate Sonde Product • Overview: • ARM data is being collected at NSA, SGP, & TWP-Manus to validate NPP CrIMSSEDRs • NSA & SGP: sondes launched 45 minutes prior and 5 minutes prior to overpass • TWP: single sonde launched 15 minutes prior to overpass • Zeroth Order Processing: • Sondes are interpolated onto common pressure grid • MWR PWV scaling applied to sonde RHs & WV mixing ratios • Sondes interpolated to overpass time • Data written to netcdf Example Sonde Pair Launch Timing • Primary ARM data products used: • sondewnpn: RS-92 balloon-borne sounding system: Vaisala-processed • mwrlos: microwave radiometer: water liq, & vapor along los path Pressure [hPa] Time [UTC}

  3. Sondescompleted at NSA & SGP, but ongoing at TWP-Manus Status Phase-1 Sonde Launches

  4. Limited collection sites, but representing a wide range of climatic conditions • Highly accurate measurements NSA SGP TWP-Manus Sonde Profiles Pressure [mb] Pressure [mb] Pressure [mb] Temperature [K] Temperature [K] Temperature [K] • Approximate Overpass Times • 13:00 UTC (04:00 AKST) • 21:00 UTC (12:00 AKST) • Approximate Overpass Times • 08:00 UTC (02:00 CST) • 19:00 UTC (13:00 CST) • Approximate Overpass Times • 03:00 UTC (13:00 PGT) • 15:00 UTC (01:00 PGT) Pressure [mb] Pressure [mb] Pressure [mb] H2O[g/kg] H2O[g/kg] H2O[g/kg]

  5. NSA Time [UTC] versus MWR Scale Factor at NSA:mean_mwrsf = 1.018 Sample MWR Measurements: NSA Time [UTC] NSA Overpass: 29-Jul-2012 21:31:26 UTC MWR Data Interpolated Sondes pwv [cm] Pressure [mb] Altitude [km] Pressure [mb] lwp [cm] 5 Time [UTC] Time [UTC]

  6. Mean MWR scale factors are close to 1 NSA SGP TWP MWR Scale Factors mwr scale factor mwr scale factor mwr scale factor Time [UTC] Time [UTC] Time [UTC] mean=1.018 mean=1.0348 mean=1.0239 mwr scale factor mwr scale factor mwr scale factor

  7. mean stdev • SGP - The variability in temperature that occurs within 45 minutes is 1°K NSA SGP Differences Between Sonde Pairs Pressure [mb] Pressure [mb] Temperature Difference [K] Temperature Difference [K] • This analysis does not follow the official 1km/2km layering methodology for reporting statistics Pressure [mb] Pressure [mb] 7 H2O Difference [g/kg] H2O Difference [g/kg]

  8. GDAS CrIMSS CrIMSS and GDAS Matchup • This analysis does not follow the official 1km/2km layering methodology for reporting statistics Pressure [mb] Pressure [mb] Temperature [K] H2O [g/kg]

  9. GDAS CrIMSS CrIMSS and GDAS Matchup • This analysis does not follow the official 1km/2km layering methodology for reporting statistics Pressure [mb] Pressure [mb] Temperature [K] RH [%]

  10. mean stdev • Analysis uses CrIMSS EDRs with MX Version 5.3 - 6.5 • This analysis does not follow the official 1km/2km layering methodology for reporting statistics NSA SGP TWP ARMBE Comparisons with CrIMSS & GDAS Pressure [mb] Pressure [mb] Pressure [mb] ARMBE-CrIMSS ARMBE-CrIMSS ARMBE-CrIMSS Temperature Difference [K] Temperature Difference [K] Temperature Difference [K] ARMBE-GDAS ARMBE-GDAS ARMBE-GDAS Pressure [mb] Pressure [mb] Pressure [mb] Temperature Difference [K] Temperature Difference [K] Temperature Difference [K]

  11. Next Steps • ARMBE v0p0 product was distributed internally December 26, 2012 • ARMBE v0p1 product will be distributed to team within the week • Zeroth Order ARMBE product including recent TWP-Manus sondes • Updated sonde averaging scheme • Updated figures • Additional variables saved to netcdf • ARMBE v1 product under development • Use gdasdata in sonde interpolation and to account for scene spatial variability • Perform vertical averaging and resolution reduction using official 1km/2km methodology • Use CrIMSS EDRs with more recent MX versions • Include cloud height information • We recommend that Phase-2 of the sonde launches begin

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